毛主席教导我们:“研究任何过程,如果是存在着两个以上矛盾的复杂过程的話,就要用全力找出它的主要矛盾。捉住了这个主要矛盾,一切問题就迎刃而解了”。在提高“九二○”含量的过程中,我们具体分析了不同矛盾及其相互关系。一般说来“九二○”大床发酵主要问题是保湿,由于没有保湿,培养基中水分蒸发较快,使发酵后期呈 Chairman Mao taught us: “If we look into any process, and if there are complicated processes with more than two contradictions, we shall try our best to find out its major contradictions. To seize this major contradiction, all problems will be solved.” In the process of raising the “920” content, we have analyzed in detail the different contradictions and their mutual relations. In general, “920” big bed fermentation main problem is moisturizing, because there is no moisture, the medium of water evaporation faster, so that the late fermentation phase